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You drop the "User" object (in System Module) onto your collection, select "No" to the dialog, and select CreateUser (select and move into right-hand panel) when prompted at the persistence type popup.
This'll add the related attribute to your object but take care to also rename it too (I normally change to say "Create User" or "Created By") before save (on your collection) because after that you cant.
If you were to look closer in your example you'd see the "Persistent Type" field is set to "CreateDateTime" for that related object.
That's perfect, exactly what I was looking for!
Thanks for your quick response.